What the others said. You use the same loo as other people don't you? A potty is not different. In fact a potty is probabyl cleaner as it would get a wipe after use when emptied and I don't know anyone who cleans their loo after each use!
We bought a pourty potty for our son in preparation for when he starts potty training, we also bought an identical one for my mother in laws where my son goes 3 days a week while I work.
My sons not ready yet but today I noticed that my nephew was using my son's new potty. Is it hygienic to do this as I don't like the thought of it being used by someone else before my son's had the opportunity to.